/*
 * Copyright (c) 2012 Andrea De Rinaldis <ozioso at ipignoli.dyndns.org>
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

package org.dyndns.ipignoli.droidcruise.ui;

import org.dyndns.ipignoli.droidcruise.notifications.MyNotification;


public abstract class UpdatableUI{
  protected static class NotificationDelayer{
    private static final int DELAY = 3;

    private int              delay;
    private int              times;
    protected MyNotification lastNotification;
    protected boolean        lastAction;

    protected NotificationDelayer(){
      this(DELAY);
    }

    protected NotificationDelayer(int delay){
      this.delay = delay;
      this.times = 0;
    }

    protected boolean shouldNotify(MyNotification notification, boolean cancel){
      if(isEqual(notification, cancel))
        return ++times == delay;
      lastNotification = notification;
      lastAction = cancel;
      times = 1;
      return delay == times;
    }

    protected boolean isEqual(MyNotification notification, boolean cancel){
      if(cancel != lastAction)
        return false;
      if(notification == null)
        return lastNotification == null;
      return notification.equals(lastNotification);
    }
  }

  protected NotificationDelayer delayer;
  private boolean               cancel;
  private MyNotification        notification;
  private boolean               mustNotify;

  protected UpdatableUI(){
    this(new NotificationDelayer());
  }

  protected UpdatableUI(NotificationDelayer delayer){
    this.delayer = delayer;
    cancel = false;
    notification = null;
    mustNotify = false;
  }

  public synchronized void sendNotification(){
    if(!mustNotify)
      return;
    if(cancel)
      notification.cancel();
    else
      notification.send();
    mustNotify = false;
  }

  protected synchronized void queueNotification(MyNotification notification,
      boolean cancel){
    if(isEqual(notification, cancel))
      return;
    this.notification = notification;
    this.cancel = cancel;
    mustNotify = true;
  }

  protected boolean isEqual(MyNotification notification, boolean cancel){
    if(cancel != this.cancel)
      return false;
    if(notification == null)
      return this.notification == null;
    return notification.equals(this.notification);
  }
}
